Trends in stage-specific incidence of prostate cancer in Norway, 1980-2010: A population-based study.

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Trends in stage-specific incidence of prostate cancer in Norway, 1980-2010: A population-based study.

November 9, 2015

To estimate changes in the stage distribution of prostate cancer during the time period where opportunistic PSA-testing was introduced.

Cancer stage, age and year of diagnosis were obtained for all men over the age of 50 diagnosed with prostate cancer in Norway during the period 1980-2010.

Three calendar-time periods (1980-1989, 1990-2000, and 2001-2010) and three age groups (50-65, 66-74, and 75+) were defined. Birth cohorts were categorized into four intervals: <1915, 1916-1925, 1926-1940 and >1941. We used Poisson regressions to conduct both a time period and cohort-based analysis of trends in the incidence of localised, regional and distant cancer for each combination of age groups and calendar-time periods or birth cohorts, respectively. Additionally, we explored the effect of cohorts on the stage-specific incidence graphically with a Poisson regression using 5-year age groups, and by estimating cumulative incidence rates for each birth cohort.

The annual incidence of localised cancers among men aged 50-65 and 66-74 rose from 41. 4 and 255. 2 per 100,000, respectively, before the introduction of PSA-testing to 137. 9 and 418. 7 in 2001-2010 afterwards, corresponding to 3. 3 (CI: 3. 1; 3. 5) and 1. 6 (CI: 1. 6; 1. 7) fold increases. The incidence of regional cancers increased by a factor seven among men aged

Opportunistic PSA-testing substantially increased the incidence of localised and regional prostate cancers among men aged 50-74 years, which was not fully compensated by the 30% decrease in incidence of distant prostate cancers in older men. This article is protected by copyright. All rights reserved.